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-7b-7=57+9b
We move all terms to the left:
-7b-7-(57+9b)=0
We add all the numbers together, and all the variables
-7b-(9b+57)-7=0
We get rid of parentheses
-7b-9b-57-7=0
We add all the numbers together, and all the variables
-16b-64=0
We move all terms containing b to the left, all other terms to the right
-16b=64
b=64/-16
b=-4
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